Join Paul F. Aubin for an in-depth discussion in this video Adding blends, part of Revit 2018: Essential Training for Architecture (Imperial).
- [Voiceover] So in this movie, continuing with our pool table, we need to provide something to support the playing surface, so this table will need some sort of legs, and to do that, we're going to create another 3D solid form. Now, we could use really any of the forms on the forms panel here to create legs for our pool table, but in this example, I want to do something a little different than what we've done previously, so let's look at the blend tool for creating the legs. So I'm going to work here in the plan view initially, and let me just sort of stretch that view out a little bit so that I can zoom in a little closer, and we're going to repeat all the same essential steps we've already done, so we're going to some reference planes, then we're going to constrain those reference planes, and then we'll create the geometry.
So on the datum panel, we're going to click our reference plane button, or "RP" is the shortcut. I always make my reference planes a little bit longer than they need to be. You'll see in a moment why that is, but it just makes them much easier to dimension. So I'll go ahead and place one vertically there, and another one here, place another one right there, all the way across, and then finally one right here. Now cancel out of there. Now I'm going to add dimensions to all of those reference planes, so I want to go from my left edge here to this reference plane.
I want to dimension the distance between these two, and then I want to dimension both of these off of the edges. Now you can see that all of those numbers are a little bit random right now, so I'll select this reference plane, click in here, and I'll set that to three inches. This one's already three inches, and I'll select this one. Let's do this first. This one is one foot, so I want to keep it one foot, so I'm going to lock that. Then I'll select this one, and when I click in here to modify the dimension and make it six inches, notice it will move both of the other reference planes because I previously locked it.
Now I want all of these dimensions locked, so I'll lock that one, I'll lock this one, and I'll lock this one and what that ensures is that this shape, this rectangle that we've defined here in the middle, if you go to Family Types, and you flex to your other size, that ensures that that rectangle flexes as well, so it's always going to maintain that three inch offset at the top and bottom and the six inch offset on the other side. So let me go back to an eight foot and click apply and then OK. So now we're ready to build the sketches for the blend shape, so I'll go back to Create, and we'll click on Blend.
And what a blend is, essentially, is an extrusion with two shapes, so you have a bottom shape and a top shape, and it just extrudes between the two and transforms as it goes. So, for the bottom shape, let's start with a rectangle. Here in the offset field, I'll put in two inches, I'll click the insertion point of two of two of those reference planes we just added, but before I click the second point over here, I want to tap the space bar to flip that shape to the inside.
And then I'll click. So now that object is two inches smaller all the way around. On the ribbon, you'll see an Edit Top button. When I click that, it finishes the bottom shape, and now I'm working on the top shape. So let's do a rectangle again, but this time, let's change the shape a little bit. Remove the offset. Set that back to zero. Then check this radius check box right here, and let's set that radius to two inches. Now I'll click directly in the view window, right at the intersection of the two reference planes, and then snap to the opposite corner like so.
Now at this point, I'll go ahead and lock all four sides, and click my modify tool to cancel out. So now you can see, if you zoom in slightly, that we've got a rounded rectangle on the top, and we've got a square cornered rectangle beneath that. When I click Finish, let's take this window and stretch it back down again so we can see the other windows, notice what that created here in the 3D view. So it blends from the square shape at the bottom up to the rounded rectangle shape at the top.
Now we were working on the reference plane level again, so it created it down at the floor, but it just arbitrarily did a one-foot depth, so to get the correct depth, all I need to do is stretch this grip at the top up until it highlights that reference plane underneath that's when I'll let go, and I will lock that to make sure that it stays there. Now in the plan view, I need to mirror it to the other side. I've already got the blend selected, but I want the reference planes to be mirrored as well.
Now you only need to select the vertical reference planes because the horizontal ones already go all the way across. So I'll select these two reference planes with the control key, hold down the control key, and also select this dimension. Go to Mirror, pick this axis. That mirrors both the blend and the two reference planes, and then finally, I'll add a new dimension between the reference plane on the right and the edge here, place it right there, and lock it. And that will guarantee that this leg stays six inches off of that other end.
So let's enlarge this view a little bit, zoom in, and go to Family Types. Let's move it out of the way, choose our seven foot table, click apply, you can see that everything is flexing, the pool table's getting smaller, the legs are adjusting with it, and I'll go back to eight feet and click OK. So always a good idea to continue flexing after you make any changes, but you can see that a blend form just gives us two shapes, but otherwise behaves much like our extrusion did, and that completes the 3D geometry that we needed for our pool table.
First, get comfortable with the Revit environment, and learn to set up a project and add the grids, levels, and dimensions that will anchor your design. Then author Paul F. Aubin helps you dive into modeling: adding walls, doors, and windows; using joins and constraints; creating and mirroring groups; linking to external assets and DWG files; and modeling floors, roofs, and ceilings.
Paul also shows advanced techniques for modeling stairs and complex walls, adding rooms, and creating schedules. Finally, discover how to annotate your drawings so all the components are clearly understood, and learn how to output sheets to DWF, PDF, or AutoCAD.
- Understanding BIM and the Revit element hierarchy
- Navigating views
- Creating a new project from a template
- Adding walls, doors, and windows
- Adding plumbing fixtures and other components
- Linking AutoCAD DWG files
- Rotating and aligning Revit links
- Working with footprint and extrusion roofs
- Adding openings
- Adding railings and extensions to stairs
- Creating stacked and curtain walls
- Hiding and isolating objects
- Adding rooms
- Creating schedule views and tags
- Adding text and dimensions
- Creating new families
- Using reference planes, parameters, and constraints
- Plotting and creating a PDF